Question 653554
-2(9+x)-(x-5)
distribute
-18-2x-x+5
-3x-13
...
The rule for combining like terms:
1) When both terms have the same sign, add the two terms and affix the common sign to the resulting addition.
2) When both terms have different signs, take the difference of the two terms and affix the sign of the larger term to the resulting difference.